Troubleshooting The Mx2020 Cooling System - Juniper MX2020 Hardware Manual

MPC LED—One LED labeled OK/FAIL on each MPC faceplate indicates the MPC's status. For more
information, see the MX Series Interface Module
MIC LED—One LED labeled OK/FAIL on each MIC faceplate indicates the MIC's status. For more
information, see the MX Series Interface Module
SFB LEDs—One LED, labeled OK/FAIL, on each SFB faceplate indicate the status of the SFB. If no LEDs
are lit, the master CB-RE might still be booting or the SFB is not receiving power.
Control Board and Routing Engine (CB-RE) LEDs—For the Control Board portion of the CB-RE, there is
one bicolor LED, labeled OK/FAIL, LINK, ExtClk-0, ExtClk-1, BITS, and GPS. For the Routing Engine
portion of the CB-RE, there are three LEDs, labeled ONLINE, MASTER, and OK/FAIL. These LEDs on
the faceplate indicate the status of the CB-RE.
NOTE: Even though the Control Board and Routing Engine (CB-RE) are combined into one
unit; the LED functionality is separate for the Control Board and Routing Engine.
AC delta or wye PDM LEDs—One LED for each input terminal block indicating the input feed status.
DC PDM LEDs—One LED on each PDM next to each of the nine –48VDC power feeds indicates the
status of that PDM incoming power.
AC or DC PSM LEDs—Four LEDs, labeled PWR OK, FAULT, INP0, and INP1, on each power supply
module faceplate indicates the status of that power supply module.
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Troubleshooting the MX2020 Cooling System
Problem
Description: The following alarms, LEDs, and other conditions indicate a problem with the cooling system:
A red alarm indicates that temperature of the router exceeds the maximum ("temperature hot") threshold.
Automatic shutdown of the power system was caused by the temperature of the router exceeding the
maximum ("temperature hot") threshold.
Reference.
Reference.
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